Yes, because lets face it, there is no need to even use the word realistic with video games- FPS's in particular. Lets say you are getting deployed in another country, fighting for your land and your life. You have a family and kids to go back to home- but you cannot just back out of a lobby. Waiting on the plane/ship to get to that country- you cannot just quit the game before it loads. Or if you get shot or die, you cannot just ragequit in the middle.
You don't have the full weight of gear and a firearm in your hand, running through bullets being scared out of your mind in video games. You run out there, kill people, die, and then respawn later.
You do not face those emotions and all of your memories in video games. Until I have something major- such as my life- to risk in such a game, there is no fear at all. Hur dur fear of your K/D going down DURP
You do not feel your foot hit the accelerator in a humvee or feel your chest get pounded with a shockwave from the IED you just ran the forget over and possible the shrapnel that can render you paralyzed for the rest of your life or just end your life that simply.